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In the TCG, destroying all cards you control and Special Summoning 1 monster from your Graveyard occurs simultaneously. In the OCG, first all cards you control are destroyed, then the monster is Special Summoned.

On Destroying and Special Summoning

The "When this card is destroyed and sent to the Graveyard: Target 1 monster in your Graveyard (if possible); destroy all cards you control, also Special Summon that monster (if any)." effect is a Trigger Effect that is activated from the Graveyard. (It is a mandatory effect. It targets. Destroying and Special Summoning are not considered to happen simultaneously.)[6]

If you control "Koa'ki Meiru Drago" and you target the LIGHT monster, since "Koa'ki Meiru Drago" is first destroyed and then the targeted monster is Special Summoned, the targeted monster is Special Summoned as usual.

Peten the Dark Clown: The effect of "Peten the Dark Clown" can only be activated when it is sent to the Graveyard. Therefore, it cannot be activated when it is sent to the Graveyard while another card effect is resolving. When the effect of "Light and Darkness Dragon" is activated, you first destroy all cards you control, and then you Special Summon the targeted monster. Since they are not considered to happen simultaneously, you cannot activate the effect of "Peten the Dark Clown".[59]

Previously Official Rulings

These TCG rulings were issued by Upper Deck Entertainment and have since been deemed unofficial by Konami.[62] They were previously considered official and can still be correct, as long as they follow the official gameplay rules, or unless Konami has issued a ruling that says otherwise. References: [63][64][65][66][67][68][69][70][71]

If the ATK and DEF of “Light and Darkness Dragon” are less than 500 when a Spell, Trap, or effect of an Effect Monster is activated, the second effect of “Light and Darkness Dragon” will still activate but when it resolves it will not negate the activation of the Spell, Trap, or effect of the Effect Monster because its ATK and DEF cannot be reduced by 500.

“Light and Darkness Dragon's” third effect is a Trigger Effect that activates whenever “Light and Darkness Dragon” is destroyed and sent to the Graveyard. This effect targets 1 monster in its owner’s Graveyard. When “Light and Darkness Dragon’s” effect is resolved, you will destroy every card you control and then Special Summon the selected monster from your Graveyard.

If your “Light and Darkness Dragon” is the only card on your side of the field when it is destroyed and sent to your Graveyard, its effect to Special Summon 1 monster from your Graveyard will still activate, even though you control no cards.

If the monster you select to Special Summon is removed from the Graveyard in Chain (by using “D.D. Crow”, etc.), before resolving the effect of “Light and Darkness Dragon”, the selected monster will not be Special Summoned but you will still destroy every card that you control.

When “Light and Darkness Dragon” is destroyed and sent to your Graveyard while you have no monsters in your Graveyard that you can Special Summon, the effect of “Light and Darkness Dragon” will not Special Summon a monster but it will still destroy every card you control.

If “Light and Darkness Dragon” is removed from the field or flipped face-down, any loses of ATK and DEF from its effect are reset and will not be reapplied when it is returned to the field or flipped face-up.

If you cannot Special Summon a monster because of a card’s effect (“Scapegoat”, etc.) when “Light and Darkness Dragon” is destroyed and sent to the Graveyard you will not be able to Special Summon the selected monster but you must still destroy every card that you control.

When “Light and Darkness Dragon” negates the activation of a Spell, Trap, or effect of an Effect Monster that can only be activated once per turn (“Blowback Dragon”, etc.), the Spell, Trap, or effect of the Effect Monster cannot be activated again because the Spell, Trap, or effect of the Effect Monster is treated as having been activated during that turn. If the effect of the Effect Monster can be activated multiple times during the same turn (“Treeborn Frog”, etc.), the effect of the Effect Monster can be activated again.

When “Light and Darkness Dragon” negates the activation of a Spirit monster's effect that would return it to its owner’s hand, the effect of the Spirit Monster activates again during the same End Phase. When the return effect of the Spirit Monster is activated during the End Phase while “Light and Darkness Dragon” has less than 500 ATK and DEF, the second effect of “Light and Darkness Dragon” will still activate, but it will not be able to negate the activation and the Spirit Monster will return to its owner's hand.

During the turn "Reverse Trap" is activated, "Light and Darkness Dragon's" second effect will only activate 1 time after "Reverse Trap" resolves. When it does, it will gain 500 ATK and DEF instead of losing 500 ATK and DEF. "Light and Darkness Dragon's" second effect will activate normally during following turns, and if it gained 500 ATK and DEF the gained ATK and DEF becomes a loss of 500 ATK and DEF.

If "Necrovalley" is acive [sic] on the field, the entire third effect of "Light and Darkness Dragon" would be negated, so the player would not destroy every card they control or Special Summon the monster targeted in their Graveyard.[61]

Notes

↑Konami Judge Program Rulings are considered unverified, as their source(s) are not publicly viewable. They are not confirmed as applicable to the TCG until they have been officially published by Konami.

↑Email Rulings are considered unverified, as their source(s) are not publicly viewable. They are not confirmed as applicable to the TCG until they have been officially published by Konami.

↑Konami OCG Card Database: If the activation or the effect of "Bahamut Shark" is negated, can that "Bahamut Shark" attack during that turn?

↑Konami OCG Card Database: If the activation of the effect of "Black Luster Soldier - Envoy of the Beginning" that banishes 1 monster on the field is negated, can that "Black Luster Soldier - Envoy of the Beginning" attack during that turn?

↑Konami OCG Card Database: If the activation of the effect of "Cardcar D" is negated by "Light and Darkness Dragon", can you Special Summon other monsters during the same turn?

↑Konami OCG Card Database: If the activation or the effect of "Card Trooper" or "Monster Reborn" is negated, can the effect of "Chaos Emperor Dragon - Envoy of the End" be activated?

↑Konami OCG Card Database: While "Constellar Belt" is active, if "Honest" activates its effect on the field, can its activation be negated by the effect of "Light and Darkness Dragon"?

↑Konami OCG Card Database: How do you resolve it when "Light and Darkness Dragon" and "Doomcaliber Knight" are both on the field?

↑Konami OCG Card Database: If the activation of the effect of "Drill Warrior" which Special Summons it is negated, then can it be activated again during the same Standby Phase?

↑Konami OCG Card Database: If the effect "Evilswarm Exciton Knight" is negated by "Skill Drain" or the effect of "Light and Darkness Dragon", is the effect that reduces all damage the opponent takes to 0 still applied?

↑Konami OCG Card Database: If the activation of the effect of "Evilswarm Ouroboros" is negated, then can you activate the same effect again?

↑Konami OCG Card Database: If the activation of the effect of "Fire King High Avatar Garunix" that Special Summons itself from the Graveyard is negated by the effect of "Divine Wrath" or "Light and Darkness Dragon", can its effect be activated once again during the same Standby Phase?

↑Konami OCG Card Database: When "Light and Darkness Dragon" is affected by "Forbidden Chalice", what does its ATK and DEF become?

↑Konami OCG Card Database: Can the effect of "Geartown" be activated if its activation is negated and sent to the Graveyard by the effect of "Light and Darkness Dragon"

↑Konami OCG Card Database: If the activation or the effect of "Hot Red Dragon Archfiend" is negated, can other monsters attack this turn?

↑Konami OCG Card Database: Can the effect of "Light and Darkness Dragon" be activated if its ATK and DEF are changed by a Spell Card?

↑Konami OCG Card Database: If the activation of the effect of "Meklord Emperor Granel" that Special Summons 1 Equip Card is negated by the effect of "Light and Darkness Dragon", then can you activate the effect again during the same turn?

↑Konami OCG Card Database: At the end of the Battle Phase, if the effect of "Metaion, the Timelord" is negated, will the effect of "Metaion, the Timelord" activate again during that same Battle Phase?

↑Konami OCG Card Database: Can "Naturia Spiderfang" attack during a turn in which the activation of a Spell/Trap Card was negated?

↑Konami OCG Card Database: If the effect of "Number 9: Dyson Sphere" that negates attacks has its activation negated by "Light and Darkness Dragon", can it be activated once again during the same Battle Step?

↑Konami OCG Card Database: If you cannot gain control of a monster through the effect of "Number 11: Big Eye", then can it attack?

↑Konami OCG Card Database: If the activation of the effect of "Number 39: Utopia" that destroys itself is negated by the effect of "Light and Darkness Dragon" or "Justice Bringer", then does it activate again?

↑Konami OCG Card Database: If the activation or the effect of "Number 72: Shogi Rook" is negated, is the battle damage that your opponent takes that turn halved?

↑Konami OCG Card Database: If the activation or the effect of "Rank-Up-Magic - The Seventh One" is negated, can "Rank-Up-Magic - The Seventh One" be used again during the same Duel?

↑Konami OCG Card Database: If the effect of "Reverse Trap" is being applied, if "Light and Darkness Dragon" effect that negates the activation is applied, will the ATK increase?

↑Konami OCG Card Database: If "Super Polymerization" is activated, can the effect of "Light and Darkness Dragon" be activated in a Chain?

↑Konami OCG Card Database: If the activation of the effect of "Triple Star Trion" is negated by "Light and Darkness Dragon", then can you activate it again during the same End Phase?

↑Konami OCG Card Database: When the effect of "Light and Darkness Dragon" resolves, if all of your Monster Card Zones are unusable, what happens?

↑Konami OCG Card Database: When the effect of "Light and Darkness Dragon" resolves, if the targeted monster is no longer in the Graveyard, what happens?

↑Konami OCG Card Database: Can you Special Summon 1 monster from your Graveyard by the effect of "Light and Darkness Dragon" even if you control no cards?

↑Konami OCG Card Database: Can the effect of "Light and Darkness Dragon" be activated if it is destroyed while in the hand or Deck?

↑Konami OCG Card Database: If a "Light and Darkness Dragon" equipped to "Dragunity Arma Leyvaten" is sent to the Graveyard, then can both effects activate?

↑Konami OCG Card Database: While you control "Koa'ki Meiru Drago", if you have an EARTH and a LIGHT monster in your Grveyard, can you Special Summon a LIGHT monster from your Graveyard by the effect of "Light and Darkness Dragon"?

↑Konami OCG Card Database: If "Peten the Dark Clown" is destroyed by the effect of "Light and Darkness Dragon", can the effect of "Peten the Dark Clown" be activated?